Robinson, O. P. (1940). Retail personnel relations. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Robinson, O. Preston. Retail Personnel Relations. New York: Prentice-Hall, 1940.
Lua MLA (9ú heag.)Robinson, O. Preston. Retail Personnel Relations. Prentice-Hall, 1940.
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